Davis and McCoo were married in 1969. They became the first African American married couple to host a network television series, The Marilyn McCoo & Billy Davis Junior. Show, on Columbia Broadcasting System in Summer 1977.
Davis joined the 5th Dimension, then called the Versatiles, in 1966.
The group"s first big hit was with 1967"s "Up, Up and Away", written by Jimmy Webb. A year later the group recorded Laura Nyro"s "Stoned Soul Picnic".
A medley of "Aquarius/Let the Sunshine In" (from the musical Hair) reached Number. The group"s recording of Nyro"s "Wedding Bell Blues" topped the Hot 100 in November 1969.
Davis sang the male lead on the group"s singles, "Worst That Could Happen", "A Change Is Gonna Come/People Got To Be Free", and "I’ll Be Lovin" You Forever".
In 1975, Davis and McCoo left the 5th Dimension and began performing as a duo. Landing a contract with American Broadcasting Company Records, they recorded their 1976 debut album, I Hope We Get to Love in Time. The first single was the title track, which was a mid-chart hit.
Their follow up, "You Don"t Have to Be a Star (To Be in My Show)", was an even bigger hit, reaching Number.
1 on the Billboard Hot 100 in January 1977. They became the first African American married couple to host a network television program, The Marilyn McCoo & Billy Davis Junior.
Show, on Columbia Broadcasting System in Summer 1977. They released one more album on American Broadcasting Company in 1978, produced by Frank Wilson and containing the popular ballad, "My Reason To Be" by songwriters Judy Wieder and John Footman.
The pair signed with Columbia Broadcasting System Records the following year and released their last album as a duo until October 2008 when the pair released The Many Faces of Love, a collection of hit songs from the 1960s and 1970s.
The album Marilyn and Billy featured the track "Saving All My Love for You", later sung by Whitney Houston, as well as a disco hit, "Shine On Silver Moon". The pair decided to go solo professionally in the early 1980s. In 1982 Davis recorded a gospel album, Let Maine Have A Dream, with Review
Davis followed up that project with a guest appearance on a jazz/popular album by Scott Scheer. Davis starred in the musical "Blues in the Night" at the Old Globe Theatre. In the role of James "Thunder" Early, he also starred in the North Carolina Theatre production of "Dreamgirls".
Kay McLain, of the Durham Herald-Sun, wrote, "Davis made an endearing character of Early…give him a microphone and the spotlight and he’s a pro." In his later guest appearances on the World Bank’s Jamie Foxx Show, he and McCoo played the affluent parents of Foxx"s girlfriend, Fancy.
Over the years, Davis has made frequent appearances on most of the national morning and night time talk and variety shows.